Shopping, spending lots of money in general. Impulsive behavior - risky behavior. They have called me suicidal but I never was when manic, just that my behavior was dangerous. Going on spontaneous trips and things - I drove to another state (2 hours) in the middle of the night just because they had a 24 hour Wendy's. Walking all night.

Edit: also talking fast and more frequently, and being more outgoing, and acting on grand plans. I actually went halfway through the process for booking Carnegie Hall, I just didn't have enough money for the deposit.